Modular multi-level hybrid distribution transformer

A modular multi-level distribution transformer technology, applied in the field of transformers, can solve problems such as circulating currents, reduce high-frequency harmonics, and increase compensation capacity

Active Publication Date: 2020-01-17
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The converter essentially adopts a parallel scheme, and there is a circulating current

Method used

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  • Modular multi-level hybrid distribution transformer
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Embodiment Construction

[0017] In order to more clearly illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The implementation examples described here are only used to explain the present invention, and are not intended to limit the present invention.

[0018] The modularized multilevel hybrid distribution transformer described in the present invention adopts the modularized multilevel technology, and applies the modularized multilevel converter integrated with multiple power unit sub-modules to the multi-winding transformer. Modular multi-level converters include modular multi-level parallel converters and modular multi-level series converters, both of which share a DC bus capacitor. The converter adopts modular multi-level technology. Multiple power unit submodules are connected. The transformer body includes a main transformer concentrical...

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Abstract

The invention discloses a modular multi-level hybrid distribution transformer. The modular multi-level hybrid distribution transformer comprises a modular multi-level converter and a transformer body,wherein the modular multi-level converter is composed of a plurality of power unit submodules. The converter comprises a modular multi-level parallel converter and a modular multi-level series converter, the modular multi-level parallel converter and the modular multi-level series converter are each composed of a plurality of power unit sub-modules, the modular multi-level parallel converter is connected into a current compensation winding, and the power grid current is regulated and controlled through the magnetic potential balance principle. The modular multi-level series converter is connected to the voltage compensation winding to adjust the load voltage; the transformer body comprises a main transformer, an auxiliary transformer and a filter inductor. Each phase of the main transformer comprises a main side winding, a secondary side winding and a current compensation winding, and each phase of the secondary transformer comprises a series winding and a voltage compensation winding. By adopting the modular multi-level hybrid distribution transformer, the switching frequency of a device can be reduced, higher harmonics can be reduced, and the modular multilevel hybrid distribution transformer can be applied to occasions with higher power.

Description

technical field [0001] The invention relates to a modularized multi-level hybrid distribution transformer, which belongs to the technical field of transformers. Background technique [0002] Traditional distribution transformers are reliable in operation and have basic functions such as voltage level conversion and power transmission. The development of smart grid puts forward high requirements on the controllability of distribution transformers. So scholars such as Sandeep Bala and Jyoti Sastry of ABB's scientific research institute put forward the design idea of ​​hybrid distribution transformer. Its notable feature is that the modular multilevel converter is connected to the distribution transformer, and the high controllability of the distribution transformer is realized by converting part of the power through the converter, so it is very suitable as a smart transformer for the next generation distribution network . [0003] In most of the current power distribution s...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1878Y02E40/20Y02E40/30Y02E40/40
Inventor 周堃梁得亮柳轶彬蔡生亮罗雅婷张立石
Owner XI AN JIAOTONG UNIV
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